Ion Propulsion…What Is It?

Juno: Exploring Jupiter’s Intense Radiation

Since 2011, our Juno spacecraft has been heading towards Jupiter, where it will study the gas giant’s atmosphere, aurora, gravity and magnetic field. Along the way, Juno has had to deal with the radiation that permeates space.

All of space is filled with particles, and when these particles get moving at high speeds, they’re called radiation. We study space radiation to better protect spacecraft as they travel through space, as well as to understand how this space environment influences planetary evolution. Once at Jupiter, Juno will have a chance to study one of the most intense radiation environments in our solar system.

Near worlds with magnetic fields – like Earth and Jupiter – these fast-moving particles can get trapped inside the magnetic fields, creating donut-shaped swaths of radiation called radiation belts.

Jupiter’s radiation belts – the glowing areas in the animation below – are especially intense, with particles so energetic that they zip up and down the belts at nearly the speed of light.

Earth also has radiation belts, but they aren’t nearly as intense as Jupiter’s – why? First, Jupiter’s magnetic field is much stronger than Earth’s, meaning that it traps and accelerates faster particles.

Second, while both Earth’s and Jupiter’s radiation belts are populated with particles from space, Jupiter also has a second source of particles – its volcanically active moon Io. Io’s volcanoes constantly release plumes of particles that are energized by Jupiter’s magnetic field. These fast particles get trapped in Jupiter’s radiation belts, making the belts that much stronger and more intense.  

In addition to studying this vast space environment, Juno engineers had to take this intense radiation into consideration when building the spacecraft. The radiation can cause instruments to degrade, interfere with measurements, and can even give the spacecraft itself an electric charge – not good for something with so many sensitive electronics.  

Since we know Jupiter is a harsh radiation environment, we designed Juno with protections in place to keep it safe. Most of Juno’s electronics live inside a half-inch-thick titanium vault, where most of the radiation can’t reach them. We also planned Juno’s orbit to swoop in very close to Jupiter’s surface, underneath the most intense pockets of radiation in Jupiter’s radiation belts.

Juno arrives at Jupiter on July 4th. Throughout its time orbiting the planet, it will send back data on Jupiter’s magnetic field and energetic particles, helping us understand this intense radiation environment better than ever before.

For updates on the Juno mission, follow the spacecraft on Facebook, Twitter, YouTube and Tumblr.

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Welcome Home HERA Mission XVII!

With the Human Exploration Research Analog (HERA) habitat, we complete studies to prepare us for exploration to asteroids, Mars, and the Moon… here on Earth! The studies are called analogs, and they simulate space missions to study how different aspects of deep space affect humans. During a HERA mission, the crew (i.e., the research participants) live and work very much as astronauts do, with minimal contact with anyone other than Mission Control for 45 days.

The most recent study, Mission XVII, just “returned to Earth” on June 18. (i.e., the participants egressed, or exited the habitat at our Johnson Space Center in Houston after their 45-day study.) We talked with the crew, Ellie, Will, Chi, and Michael, about the experience. Here are some highlights!

Why did you decide to participate in HERA Mission XVII?

HERA Mission VXII participants (from left to right) Ellie, Will, Chi, and Michael.

“My master’s is in human factors,” said Chi, who studies the interaction between humans and other systems at Embry-Riddle Aeronautical University. “I figured this would be a cool way to study the other side of the table and actually participate in an analog.” For Michael, who holds a PhD in aerospace engineering and researches immunology and radio biology, it was an opportunity to experience life as an astronaut doing science in space. “I’ve flown [experiments] on the space station and shuttle,” he said. “Now I wanted to see the other side.” For Will, a geosciences PhD, it provided an opportunity to contribute to space exploration and neuroscience, which he considers two of the biggest fields with the most potential in science. “Here, we have this project that is the perfect intersection of those two things,” he said. And Ellie, a pilot in the Air Force, learned about HERA while working on her master’s thesis on Earth and space analogs and how to improve them for deep-space studies. “A lot of my interests are similar to Chi’s,” she said. “Human factors and physiological aspects are things that I find very fascinating.”

NASA missions all have patches, and HERA Mission XVII is no different. Did you get to design your patch?

HERA Mission VXII patch, which reads “May the Force be with you” in Latin and features Star Wars iconography. It’s a reference to the mission’s start date, May 4th aka Star Wars Day!

“We did!” They said …with a little the help from Michael’s brother, who is a designer. He drew several different designs based on the crew’s ideas. They picked one and worked together on tweaks. “We knew we were going [inside the habitat] on May Fourth,” Michael said. “We knew it would be Star Wars Day. So we did a Star Wars theme.” The patch had to come together fairly quickly though, since a Star Wars Day “launch” wasn’t the initial plan. “We were supposed to start two weeks earlier,” Ellie said. “It just so happened the new start date was May the Fourth!” Along with the Star Wars imagery, the patch includes a hurricane symbol, to pay tribute to hurricane Harvey which caused a previous crew to end their mission early, and an image of the HERA habitat. Will joked that designing the patch was “our first team task.”

How much free time did you have and what did you do with it?

HERA Mission XVII crew looking down the ladders inside the habitat.

“It was a decent amount,” Michael said. “I could have used more on the harder days, but in a way it’s good we didn’t have more because it’s harder to stay awake when you have nothing to do.” (The mission included a sleep reduction study, which meant the crew only got five hours of sleep a night five days a week.) “With the time I did have, I read a lot,” he said. He also drew, kept a journal, and “wrote bad haikus.” Because of the sleep study, Ellie didn’t read as much. “For me, had I tried to read or sit and do anything not interactive, I would have fallen asleep,” she said.

The crew’s art gallery, where they hung drawing and haikus they wrote.

Journaling and drawing were popular ways to pass the time. “We developed a crew art gallery on one of the walls,” Will said. They also played board games—in particular a game where you score points by making words with lettered tiles on a 15×15 grid. (Yes that one!) “Playing [that game] with two scientists wasn’t always fun though,” Ellie joked, referencing some of the more obscure vocabulary words Will and Michael had at the ready. “I was like, ‘What does that word mean?’ ‘Well that word means lava flow,” she said laughing. (The rest of the crew assured us she fared just fine.)

Chi tried reading, but found it difficult due to the dimmed lights that were part of an onboard light study. She took on a side project instead: 1000 paper cranes. “There is a story in Japan—I’m half Japanese—that if you make a 1000 cranes, it’s supposed to grant you a wish,” she said. She gave hers to her grandmother.

The whole crew having dinner together on “Sophisticated Saturdays!” From left to right: Will, Ellie, Chi, and Michael. They’re wearing their Saturday best, which includes the usual research equipment.

On weekends, the crew got eight hours of sleep, which they celebrated with “Sophisticated Saturdays!” “Coming in, we all brought an outfit that was a little fancy,” Ellie said. (Like a tie, a vest, an athletic dress—that kind of thing.) “We would only put it on Saturday evenings, and we’d have dinner on the first level at the one and only table we could all sit at and face each other,” she said. “We would pretend it was a different fancy restaurant every week.”

The table set for a “civilized” Saturday dinner. Once the crew’s hydroponics grew, they were able to add some greenery to the table.

“It was a way to feel more civilized,” Will said, who then offered another great use of their free time: establishing good habits. “I would use the free time to journal, for example. I’d just keep it up every day. That and stretching. Hydrating. Flossing.”

Like real astronauts, you were in contact with Mission Control and further monitored by HERA personnel. Was it weird being on camera all the time?

HERA personnel and the monitors they use for a typical HERA mission.

“I was always aware of it,” Michael said, “but I don’t think it changed my behavior. It’s not like I forgot about it. It was always there. I just wasn’t willing to live paranoid for 45 days.” Ellie agreed. “It was always in the back of my mind,” she said, further adding that they wore microphones and various other sensors. “We were wired all the time,” she said.

After the study, the crew met up with the people facilitating the experiments, sometimes for the first time. “It was really fun to meet Mission Control afterwards,” Will said. “They had just been this voice coming from the little boxes. It was great getting to meet them and put faces to the voices,” he said. “Of course, they knew us well. Very well.”

For more information on HERA, visit our analogs homepage.

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Solar System: 5 Things to Know This Week

The solar system is huge, so let us break it down for you. Here are 5 things you should know this week:

1. Mini-Moons

This week, the robotic spacecraft Cassini will pass a pair of tiny Saturnian moons. Daphnis, only 5.7 miles (9.2 km) across, orbits within the Keeler Gap in Saturn's outer A ring. Daphnis' slight gravity maintains that gap. Cassini will then swing by Telesto, a small moon that shares its orbit with Tethys. Cassini's cameras should get some good pictures of these tiny worlds.

2. Stardust Memories

Jan. 15 is the 10th anniversary of the day the Stardust capsule returned to Earth, carrying pieces of a comet. The Stardust spacecraft passed right through the gas and dust surrounding the icy nucleus of Wild 2 (pronounced "Vilt-2") in January 2004, then sent the samples it collected home for laboratory analysis.

3. Sun Surfing in the 70s

Jan. 15 is the 40th anniversary of the launch of Helios 2, the second of a pair of spacecraft launched by NASA and built by Germany to investigate the sun. Helios 2 flew to within about 27 million miles (44 million km) of the sun's surface in 1976. The spacecraft provided important information on solar plasma, the solar wind, cosmic rays, and cosmic dust, and also performed magnetic field and electrical field experiments. A NASA mission set to launch in 2018 will dare an even closer approach.

4. To Space, to Watch the Seas

Jason 3, an international mission to continue U.S.- European satellite measurements of the topography of the ocean surface, is scheduled to launch on Jan. 17. The mission will make highly detailed measurements of sea-level on Earth to gain insight into ocean circulation and climate change.

5. Getting Serious About Ceres

This is getting good. Over the past few weeks, the Dawn mission has been tantalizing us with ever-closer images of the dwarf planet Ceres, the largest object in the main asteroid belt and a small world in its own right. Now, the robotic spacecraft has used its ion engines to ease down into its lowest mapping orbit in order to scrutinize Ceres up close, and already the pictures are spectacular. Odd mountains, deep craters and fissures—not to mention those famous bright spots—will all be coming into sharper focus during the coming days.

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Why's your suit so colorful?

Are You Ready to #BeTheSpark?

Students - want to modify a NASA Spinoff technology and solve a real word problem?

Our Optimus Prime Spinoff Promotion and Research Challenge, known as OPSPARC for short, is a student challenge that guides teams through various NASA Spinoff technologies that are in their everyday world. The teams use their imagination, creativity, and engineering skills to develop their own ideas for NASA spinoff technology.

Spinoffs are technologies originally created for space and modified into everyday products used here on Earth.

Perhaps the most widely recognized NASA spinoff, memory foam was invented by NASA-funded researchers looking for ways to keep test pilots cushioned during flights. Today, memory foam makes for more comfortable beds, couches and chairs, not to mention better shoes, movie theater seats and even football helmets.

There are more than two-thousand NASA Spinoffs They include memory foam, invisible braces, firefighting equipment, programmable pace makers, artificial limbs, scratch-resistant lenses, aircraft anti-icing systems, endangered species tracking software, cochlear implants, satellite television, long-distance telecommunications, and many, many more.

The deadline has been extended to February 26th for our Mission 3 student challenge. Sign up NOW here: https://opsparc.gsfc.nasa.gov/

Fans of the Hasbro TRANSFORMERS brand will pick up on the play on words between the challenge name, OPSPARC, and the "AllSpark" from the TRANSFORMERS universe. The AllSpark is what gave the TRANSFORMERS robots life and knowledge, which they use to help mankind — just like NASA spinoffs. Students from around the globe will have the opportunity to Be The Spark!

OPTIMUS PRIME and TRANSFORMERS are trademarks of Hasbro and are used with permission. © 2018 Hasbro, Inc. All Rights Reserved.

Game Time: Final Voting for Tournament Earth

The moment has arrived- it's time to decide the NASA Earth Observatory's all-time best image. After four grueling rounds of voting, two contenders remain: Ocean Sand, Bahamas (#5 seed) versus Raikoke Erupts (#6 seed).

The road to the finals has been full of surprises. All top seeds have been knocked out. In one semifinal, Ocean Sand garnered 50.6 percent of the votes to squeak out a win over the overall favorite, Twin Blue Marbles. In the other matchup, Raikoke Erupts trounced Where the Dunes End, 66.5 to 33.5 percent.

Now you have to pick a champion. Will it be a gorgeous, artistic image from the very early years of Earth Observatory or stunning natural-color views of an explosive event from 2019? Which image will you crown as the best in the EO archives: Ocean Sand, Bahamas or Raikoke Erupts? Voting ends on April 28 at 9 a.m. U.S. Eastern Time.

Thank you for helping us celebrate Earth Observatory’s 20th anniversary and the 50th anniversary of Earth Day!

Vote here: https://earthobservatory.nasa.gov/tournament-earth

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6 Things You Didn’t Know About Our ‘First’ Space Flight Center

When NASA began operations on Oct. 1, 1958, we consisted mainly of the four laboratories of our predecessor, the National Advisory Committee for Aeronautics (NACA). Hot on the heels of NASA’s first day of business, we opened the Goddard Space Flight Center. Chartered May 1, 1959, and located in Greenbelt, Maryland, Goddard is home to one of the largest groups of scientists and engineers in the world. These people are building, testing and experimenting their way toward answering some of the universe’s most intriguing questions.

To celebrate 60 years of exploring, here are six ways Goddard shoots for the stars.

For the last 60 years, we’ve kept a close eye on our home planet, watching its atmosphere, lands and ocean.

Goddard instruments were crucial in tracking the hole in the ozone layer over Antarctica as it grew and eventually began to show signs of healing. Satellites and field campaigns track the changing height and extent of ice around the globe. Precipitation missions give us a global, near-real-time look at rain and snow everywhere on Earth. Researchers keep a record of the planet’s temperature, and Goddard supercomputer models consider how Earth will change with rising temperatures. From satellites in Earth’s orbit to field campaigns in the air and on the ground, Goddard is helping us understand our planet.

We seek to answer the big questions about our universe: Are we alone? How does the universe work? How did we get here?

We’re piecing together the story of our cosmos, from now all the way back to its start 13.7 billion years ago. Goddard missions have contributed to our understanding of the big bang and have shown us nurseries where stars are born and what happens when galaxies collide. Our ongoing census of planets far beyond our own solar system (several thousand known and counting!) is helping us hone in on which ones might be potentially habitable.

We study our dynamic Sun.

Our Sun is an active star, with occasional storms and a constant outflow of particles, radiation and magnetic fields that fill the solar system out far past the orbit of Neptune. Goddard scientists study the Sun and its activity with a host of satellites to understand how our star affects Earth, planets throughout the solar system and the nature of the very space our astronauts travel through.

We explore the planets, moons and small objects in the solar system and beyond. 

Goddard instruments (well over 100 in total!) have visited every planet in the solar system and continue on to new frontiers. What we’ve learned about the history of our solar system helps us piece together the mysteries of life: How did life in our solar system form and evolve? Can we find life elsewhere?

Over 60 years, our communications networks have enabled hundreds of NASA spacecraft to “phone home.”

Today, Goddard communications networks bring down 98 percent of our spacecraft data – nearly 30 terabytes per day! This includes not only science data, but also key information related to spacecraft operations and astronaut health. Goddard is also leading the way in creating cutting-edge solutions like laser communications that will enable exploration – faster, better, safer – for generations to come. Pew pew!

Exploring the unknown often means we must create new ways of exploring, new ways of knowing what we’re “seeing.” 

Goddard’s technologists and engineers must often invent tools, mechanisms and sensors to return information about our universe that we may not have even known to look for when the center was first commissioned.

Behind every discovery is an amazing team of people, pushing the boundaries of humanity’s knowledge. Here’s to the ones who ask questions, find answers and ask questions some more!

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What’s a Space Headache?

Headaches can be a common complaint during spaceflight. The Space Headaches experiment improves our understanding of such conditions, which helps in the development of methods to alleviate associated symptoms, and improve the well-being and performance of crew members in orbit. This can also improve our knowledge of similar conditions on Earth.

What Astronauts in Space Eat in a Day

There was a time when even NASA didn’t know if humans could eat in the microgravity environment of space. Thankfully for the future of long-term crewed missions, John Glenn proved that it was indeed possible when he ate applesauce from an aluminum tube while orbiting the Earth in 1962.

Since then, the research conducted at our Space Food Systems Laboratory at Johnson Space Center has resulted in improved taste, variety and packaging of foods intended for space travel. Current-day astronauts are now given a standard menu of over 200 approved food and drink items months before launch, allowing them to plan their daily meals far in advance.

So, with such a variety of foods to choose from, what does the typical astronaut eat in a day?  Here is an example from the International Space Station standard menu:

Sounds tasty, right?

However, these are only suggestions for astronauts, so they still have some choice over what they ultimately eat. Many astronauts, including Tim Kopra, combine different ingredients for meals.

Others plan to eat special foods for the holidays. Astronauts Scott Kelly and Kjell Lindgren did just that on Thanksgiving last year when they ate smoked turkey, candied yams, corn and potatoes au gratin.

Another key factor that influences what astronauts eat is the availability of fresh fruits and vegetables, which are delivered via resupply spacecrafts.  When these foods arrive to the space station, they must be eaten quickly before they spoil. Astronaut Tim Peake doesn’t seem to mind.

Nutrition is important to help counteract some of the effects spaceflight have on the body, such as bone and muscle loss, cardiovascular degradation, impairment of immune function, neurovestibular changes and vision changes. 

“Nutrition is vital to the mission,” Scott M. Smith, Ph.D., manager for NASA’s Nutritional Biochemistry Lab said. “Without proper nutrition for the astronauts, the mission will fail. It’s that simple.”

We work hard to help astronauts feel less homesick by providing them with food that not only reminds them of life back on Earth, but is also nutritious and healthy. 

Here are some unusual space food inventions that are no longer in use:

Gelatin-coated sandwich and cookie cubes

Compressed bacon squares

Freeze dried ice cream

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@ladyknighttime: What's your favorite activity to do in space that you might not have expected?